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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

** Also affects: nova/queens
   Importance: Undecided
       Status: New

** Changed in: nova/queens
       Status: New => Confirmed

** Changed in: nova/queens
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1746558

Title:
  Make service all-cells min version helper use scatter-gather

Status in OpenStack Compute (nova):
  In Progress
Status in OpenStack Compute (nova) pike series:
  Confirmed
Status in OpenStack Compute (nova) queens series:
  Confirmed

Bug description:
  Currently the "get_minimum_version_all_cells" function in service runs
  sequentially and this affects the performance in case of large
  deployments (running a lot of cells) :
  https://github.com/openstack/nova/blob/stable/pike/nova/objects/service.py#L440

  So it would be nice to use the scatter_gather_all_cells function to do
  this operation in parallel.

  Also apart from the performance scaling point of view, in case
  connection to a particular cell fails, it would be nice to have
  sentinels returned which is done by the scatter_gather_all_cells. This
  helps when a cell is down.

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